216 On the transverse Strength of Timber. 



Experiments on the Resilience of Timber. 



The pieces were each an inch in depth, and laid upon supports 

 thirty inches apart. The weight fell between two vertical guides 

 (similar to a pile engine), upon the middle of the piece. 



No. 11 was a dark- coloured and apparently very strong piece 

 of wood; specific gravity 0"872 or S-ly lbs. per cubic foot *. On 

 the whole then it appears, that larch is superior to oak in stiff- 

 ness, in strength, and in the |)ower of resisting a body in motion 

 (called resilience) ; and it is inferior to Memel or Riga timber in 

 stiffness only. 



I am, sir, yours, &:c. 



Grove End, March 16, 1818, ThoMAS TrEDGOLD. 



* These experiments were made in the presence of his Grace the Duke 

 of AthoU, Lord Prudhoe, Lord James Murray, John Deas Thomson, Esq. 

 William Adair, Esq., Mr. Geo. Bullock, and Mr. Atkinson, architect to the 

 Ordnance. 



XXXVIII. No~ 



